1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
4  *
5  *  Copyright (C) 2007-2008 Yan Burman
6  *  Copyright (C) 2008 Eric Piel
7  *  Copyright (C) 2008-2009 Pavel Machek
8  */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/kernel.h>
13 #include <linux/sched/signal.h>
14 #include <linux/dmi.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/platform_device.h>
18 #include <linux/interrupt.h>
19 #include <linux/input-polldev.h>
20 #include <linux/delay.h>
21 #include <linux/wait.h>
22 #include <linux/poll.h>
23 #include <linux/slab.h>
24 #include <linux/freezer.h>
25 #include <linux/uaccess.h>
26 #include <linux/miscdevice.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/atomic.h>
29 #include <linux/of_device.h>
30 #include "lis3lv02d.h"
31 
32 #define DRIVER_NAME     "lis3lv02d"
33 
34 /* joystick device poll interval in milliseconds */
35 #define MDPS_POLL_INTERVAL 50
36 #define MDPS_POLL_MIN	   0
37 #define MDPS_POLL_MAX	   2000
38 
39 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
40 
41 #define SELFTEST_OK	       0
42 #define SELFTEST_FAIL	       -1
43 #define SELFTEST_IRQ	       -2
44 
45 #define IRQ_LINE0	       0
46 #define IRQ_LINE1	       1
47 
48 /*
49  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
50  * because they are generated even if the data do not change. So it's better
51  * to keep the interrupt for the free-fall event. The values are updated at
52  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
53  * some low processor, we poll the sensor only at 20Hz... enough for the
54  * joystick.
55  */
56 
57 #define LIS3_PWRON_DELAY_WAI_12B	(5000)
58 #define LIS3_PWRON_DELAY_WAI_8B		(3000)
59 
60 /*
61  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
62  * LIS302D spec says: 18 mG / digit
63  * LIS3_ACCURACY is used to increase accuracy of the intermediate
64  * calculation results.
65  */
66 #define LIS3_ACCURACY			1024
67 /* Sensitivity values for -2G +2G scale */
68 #define LIS3_SENSITIVITY_12B		((LIS3_ACCURACY * 1000) / 1024)
69 #define LIS3_SENSITIVITY_8B		(18 * LIS3_ACCURACY)
70 
71 /*
72  * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG.
73  * Below macros defines sensitivity values for +/-2G. Dataout bits for
74  * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit
75  * data from 16bit value. Currently this driver supports only 2G range.
76  */
77 #define LIS3DLH_SENSITIVITY_2G		((LIS3_ACCURACY * 1000) / 1024)
78 #define SHIFT_ADJ_2G			4
79 
80 #define LIS3_DEFAULT_FUZZ_12B		3
81 #define LIS3_DEFAULT_FLAT_12B		3
82 #define LIS3_DEFAULT_FUZZ_8B		1
83 #define LIS3_DEFAULT_FLAT_8B		1
84 
85 struct lis3lv02d lis3_dev = {
86 	.misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
87 };
88 EXPORT_SYMBOL_GPL(lis3_dev);
89 
90 /* just like param_set_int() but does sanity-check so that it won't point
91  * over the axis array size
92  */
93 static int param_set_axis(const char *val, const struct kernel_param *kp)
94 {
95 	int ret = param_set_int(val, kp);
96 	if (!ret) {
97 		int val = *(int *)kp->arg;
98 		if (val < 0)
99 			val = -val;
100 		if (!val || val > 3)
101 			return -EINVAL;
102 	}
103 	return ret;
104 }
105 
106 static const struct kernel_param_ops param_ops_axis = {
107 	.set = param_set_axis,
108 	.get = param_get_int,
109 };
110 
111 #define param_check_axis(name, p) param_check_int(name, p)
112 
113 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
114 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
115 
116 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
117 {
118 	s8 lo;
119 	if (lis3->read(lis3, reg, &lo) < 0)
120 		return 0;
121 
122 	return lo;
123 }
124 
125 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
126 {
127 	u8 lo, hi;
128 
129 	lis3->read(lis3, reg - 1, &lo);
130 	lis3->read(lis3, reg, &hi);
131 	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
132 	return (s16)((hi << 8) | lo);
133 }
134 
135 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
136 static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg)
137 {
138 	u8 lo, hi;
139 	int v;
140 
141 	lis3->read(lis3, reg - 1, &lo);
142 	lis3->read(lis3, reg, &hi);
143 	v = (int) ((hi << 8) | lo);
144 
145 	return (s16) v >> lis3->shift_adj;
146 }
147 
148 /**
149  * lis3lv02d_get_axis - For the given axis, give the value converted
150  * @axis:      1,2,3 - can also be negative
151  * @hw_values: raw values returned by the hardware
152  *
153  * Returns the converted value.
154  */
155 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
156 {
157 	if (axis > 0)
158 		return hw_values[axis - 1];
159 	else
160 		return -hw_values[-axis - 1];
161 }
162 
163 /**
164  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
165  * @lis3: pointer to the device struct
166  * @x:    where to store the X axis value
167  * @y:    where to store the Y axis value
168  * @z:    where to store the Z axis value
169  *
170  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
171  */
172 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
173 {
174 	int position[3];
175 	int i;
176 
177 	if (lis3->blkread) {
178 		if (lis3->whoami == WAI_12B) {
179 			u16 data[3];
180 			lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
181 			for (i = 0; i < 3; i++)
182 				position[i] = (s16)le16_to_cpu(data[i]);
183 		} else {
184 			u8 data[5];
185 			/* Data: x, dummy, y, dummy, z */
186 			lis3->blkread(lis3, OUTX, 5, data);
187 			for (i = 0; i < 3; i++)
188 				position[i] = (s8)data[i * 2];
189 		}
190 	} else {
191 		position[0] = lis3->read_data(lis3, OUTX);
192 		position[1] = lis3->read_data(lis3, OUTY);
193 		position[2] = lis3->read_data(lis3, OUTZ);
194 	}
195 
196 	for (i = 0; i < 3; i++)
197 		position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
198 
199 	*x = lis3lv02d_get_axis(lis3->ac.x, position);
200 	*y = lis3lv02d_get_axis(lis3->ac.y, position);
201 	*z = lis3lv02d_get_axis(lis3->ac.z, position);
202 }
203 
204 /* conversion btw sampling rate and the register values */
205 static int lis3_12_rates[4] = {40, 160, 640, 2560};
206 static int lis3_8_rates[2] = {100, 400};
207 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
208 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
209 
210 /* ODR is Output Data Rate */
211 static int lis3lv02d_get_odr(struct lis3lv02d *lis3)
212 {
213 	u8 ctrl;
214 	int shift;
215 
216 	lis3->read(lis3, CTRL_REG1, &ctrl);
217 	ctrl &= lis3->odr_mask;
218 	shift = ffs(lis3->odr_mask) - 1;
219 	return lis3->odrs[(ctrl >> shift)];
220 }
221 
222 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
223 {
224 	int div = lis3lv02d_get_odr(lis3);
225 
226 	if (WARN_ONCE(div == 0, "device returned spurious data"))
227 		return -ENXIO;
228 
229 	/* LIS3 power on delay is quite long */
230 	msleep(lis3->pwron_delay / div);
231 	return 0;
232 }
233 
234 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
235 {
236 	u8 ctrl;
237 	int i, len, shift;
238 
239 	if (!rate)
240 		return -EINVAL;
241 
242 	lis3->read(lis3, CTRL_REG1, &ctrl);
243 	ctrl &= ~lis3->odr_mask;
244 	len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
245 	shift = ffs(lis3->odr_mask) - 1;
246 
247 	for (i = 0; i < len; i++)
248 		if (lis3->odrs[i] == rate) {
249 			lis3->write(lis3, CTRL_REG1,
250 					ctrl | (i << shift));
251 			return 0;
252 		}
253 	return -EINVAL;
254 }
255 
256 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
257 {
258 	u8 ctlreg, reg;
259 	s16 x, y, z;
260 	u8 selftest;
261 	int ret;
262 	u8 ctrl_reg_data;
263 	unsigned char irq_cfg;
264 
265 	mutex_lock(&lis3->mutex);
266 
267 	irq_cfg = lis3->irq_cfg;
268 	if (lis3->whoami == WAI_8B) {
269 		lis3->data_ready_count[IRQ_LINE0] = 0;
270 		lis3->data_ready_count[IRQ_LINE1] = 0;
271 
272 		/* Change interrupt cfg to data ready for selftest */
273 		atomic_inc(&lis3->wake_thread);
274 		lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
275 		lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
276 		lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
277 				~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
278 				(LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
279 	}
280 
281 	if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
282 		ctlreg = CTRL_REG4;
283 		selftest = CTRL4_ST0;
284 	} else {
285 		ctlreg = CTRL_REG1;
286 		if (lis3->whoami == WAI_12B)
287 			selftest = CTRL1_ST;
288 		else
289 			selftest = CTRL1_STP;
290 	}
291 
292 	lis3->read(lis3, ctlreg, &reg);
293 	lis3->write(lis3, ctlreg, (reg | selftest));
294 	ret = lis3lv02d_get_pwron_wait(lis3);
295 	if (ret)
296 		goto fail;
297 
298 	/* Read directly to avoid axis remap */
299 	x = lis3->read_data(lis3, OUTX);
300 	y = lis3->read_data(lis3, OUTY);
301 	z = lis3->read_data(lis3, OUTZ);
302 
303 	/* back to normal settings */
304 	lis3->write(lis3, ctlreg, reg);
305 	ret = lis3lv02d_get_pwron_wait(lis3);
306 	if (ret)
307 		goto fail;
308 
309 	results[0] = x - lis3->read_data(lis3, OUTX);
310 	results[1] = y - lis3->read_data(lis3, OUTY);
311 	results[2] = z - lis3->read_data(lis3, OUTZ);
312 
313 	ret = 0;
314 
315 	if (lis3->whoami == WAI_8B) {
316 		/* Restore original interrupt configuration */
317 		atomic_dec(&lis3->wake_thread);
318 		lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
319 		lis3->irq_cfg = irq_cfg;
320 
321 		if ((irq_cfg & LIS3_IRQ1_MASK) &&
322 			lis3->data_ready_count[IRQ_LINE0] < 2) {
323 			ret = SELFTEST_IRQ;
324 			goto fail;
325 		}
326 
327 		if ((irq_cfg & LIS3_IRQ2_MASK) &&
328 			lis3->data_ready_count[IRQ_LINE1] < 2) {
329 			ret = SELFTEST_IRQ;
330 			goto fail;
331 		}
332 	}
333 
334 	if (lis3->pdata) {
335 		int i;
336 		for (i = 0; i < 3; i++) {
337 			/* Check against selftest acceptance limits */
338 			if ((results[i] < lis3->pdata->st_min_limits[i]) ||
339 			    (results[i] > lis3->pdata->st_max_limits[i])) {
340 				ret = SELFTEST_FAIL;
341 				goto fail;
342 			}
343 		}
344 	}
345 
346 	/* test passed */
347 fail:
348 	mutex_unlock(&lis3->mutex);
349 	return ret;
350 }
351 
352 /*
353  * Order of registers in the list affects to order of the restore process.
354  * Perhaps it is a good idea to set interrupt enable register as a last one
355  * after all other configurations
356  */
357 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
358 			       FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
359 			       CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
360 			       CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
361 			       CTRL_REG1, CTRL_REG2, CTRL_REG3};
362 
363 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
364 			       FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
365 			       DD_THSE_L, DD_THSE_H,
366 			       CTRL_REG1, CTRL_REG3, CTRL_REG2};
367 
368 static inline void lis3_context_save(struct lis3lv02d *lis3)
369 {
370 	int i;
371 	for (i = 0; i < lis3->regs_size; i++)
372 		lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
373 	lis3->regs_stored = true;
374 }
375 
376 static inline void lis3_context_restore(struct lis3lv02d *lis3)
377 {
378 	int i;
379 	if (lis3->regs_stored)
380 		for (i = 0; i < lis3->regs_size; i++)
381 			lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
382 }
383 
384 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
385 {
386 	if (lis3->reg_ctrl)
387 		lis3_context_save(lis3);
388 	/* disable X,Y,Z axis and power down */
389 	lis3->write(lis3, CTRL_REG1, 0x00);
390 	if (lis3->reg_ctrl)
391 		lis3->reg_ctrl(lis3, LIS3_REG_OFF);
392 }
393 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
394 
395 int lis3lv02d_poweron(struct lis3lv02d *lis3)
396 {
397 	int err;
398 	u8 reg;
399 
400 	lis3->init(lis3);
401 
402 	/*
403 	 * Common configuration
404 	 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
405 	 *      both have been read. So the value read will always be correct.
406 	 * Set BOOT bit to refresh factory tuning values.
407 	 */
408 	if (lis3->pdata) {
409 		lis3->read(lis3, CTRL_REG2, &reg);
410 		if (lis3->whoami ==  WAI_12B)
411 			reg |= CTRL2_BDU | CTRL2_BOOT;
412 		else if (lis3->whoami ==  WAI_3DLH)
413 			reg |= CTRL2_BOOT_3DLH;
414 		else
415 			reg |= CTRL2_BOOT_8B;
416 		lis3->write(lis3, CTRL_REG2, reg);
417 
418 		if (lis3->whoami ==  WAI_3DLH) {
419 			lis3->read(lis3, CTRL_REG4, &reg);
420 			reg |= CTRL4_BDU;
421 			lis3->write(lis3, CTRL_REG4, reg);
422 		}
423 	}
424 
425 	err = lis3lv02d_get_pwron_wait(lis3);
426 	if (err)
427 		return err;
428 
429 	if (lis3->reg_ctrl)
430 		lis3_context_restore(lis3);
431 
432 	return 0;
433 }
434 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
435 
436 
437 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
438 {
439 	struct lis3lv02d *lis3 = pidev->private;
440 	int x, y, z;
441 
442 	mutex_lock(&lis3->mutex);
443 	lis3lv02d_get_xyz(lis3, &x, &y, &z);
444 	input_report_abs(pidev->input, ABS_X, x);
445 	input_report_abs(pidev->input, ABS_Y, y);
446 	input_report_abs(pidev->input, ABS_Z, z);
447 	input_sync(pidev->input);
448 	mutex_unlock(&lis3->mutex);
449 }
450 
451 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
452 {
453 	struct lis3lv02d *lis3 = pidev->private;
454 
455 	if (lis3->pm_dev)
456 		pm_runtime_get_sync(lis3->pm_dev);
457 
458 	if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
459 		atomic_set(&lis3->wake_thread, 1);
460 	/*
461 	 * Update coordinates for the case where poll interval is 0 and
462 	 * the chip in running purely under interrupt control
463 	 */
464 	lis3lv02d_joystick_poll(pidev);
465 }
466 
467 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
468 {
469 	struct lis3lv02d *lis3 = pidev->private;
470 
471 	atomic_set(&lis3->wake_thread, 0);
472 	if (lis3->pm_dev)
473 		pm_runtime_put(lis3->pm_dev);
474 }
475 
476 static irqreturn_t lis302dl_interrupt(int irq, void *data)
477 {
478 	struct lis3lv02d *lis3 = data;
479 
480 	if (!test_bit(0, &lis3->misc_opened))
481 		goto out;
482 
483 	/*
484 	 * Be careful: on some HP laptops the bios force DD when on battery and
485 	 * the lid is closed. This leads to interrupts as soon as a little move
486 	 * is done.
487 	 */
488 	atomic_inc(&lis3->count);
489 
490 	wake_up_interruptible(&lis3->misc_wait);
491 	kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
492 out:
493 	if (atomic_read(&lis3->wake_thread))
494 		return IRQ_WAKE_THREAD;
495 	return IRQ_HANDLED;
496 }
497 
498 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
499 {
500 	struct input_dev *dev = lis3->idev->input;
501 	u8 click_src;
502 
503 	mutex_lock(&lis3->mutex);
504 	lis3->read(lis3, CLICK_SRC, &click_src);
505 
506 	if (click_src & CLICK_SINGLE_X) {
507 		input_report_key(dev, lis3->mapped_btns[0], 1);
508 		input_report_key(dev, lis3->mapped_btns[0], 0);
509 	}
510 
511 	if (click_src & CLICK_SINGLE_Y) {
512 		input_report_key(dev, lis3->mapped_btns[1], 1);
513 		input_report_key(dev, lis3->mapped_btns[1], 0);
514 	}
515 
516 	if (click_src & CLICK_SINGLE_Z) {
517 		input_report_key(dev, lis3->mapped_btns[2], 1);
518 		input_report_key(dev, lis3->mapped_btns[2], 0);
519 	}
520 	input_sync(dev);
521 	mutex_unlock(&lis3->mutex);
522 }
523 
524 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
525 {
526 	int dummy;
527 
528 	/* Dummy read to ack interrupt */
529 	lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
530 	lis3->data_ready_count[index]++;
531 }
532 
533 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
534 {
535 	struct lis3lv02d *lis3 = data;
536 	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
537 
538 	if (irq_cfg == LIS3_IRQ1_CLICK)
539 		lis302dl_interrupt_handle_click(lis3);
540 	else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
541 		lis302dl_data_ready(lis3, IRQ_LINE0);
542 	else
543 		lis3lv02d_joystick_poll(lis3->idev);
544 
545 	return IRQ_HANDLED;
546 }
547 
548 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
549 {
550 	struct lis3lv02d *lis3 = data;
551 	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
552 
553 	if (irq_cfg == LIS3_IRQ2_CLICK)
554 		lis302dl_interrupt_handle_click(lis3);
555 	else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
556 		lis302dl_data_ready(lis3, IRQ_LINE1);
557 	else
558 		lis3lv02d_joystick_poll(lis3->idev);
559 
560 	return IRQ_HANDLED;
561 }
562 
563 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
564 {
565 	struct lis3lv02d *lis3 = container_of(file->private_data,
566 					      struct lis3lv02d, miscdev);
567 
568 	if (test_and_set_bit(0, &lis3->misc_opened))
569 		return -EBUSY; /* already open */
570 
571 	if (lis3->pm_dev)
572 		pm_runtime_get_sync(lis3->pm_dev);
573 
574 	atomic_set(&lis3->count, 0);
575 	return 0;
576 }
577 
578 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
579 {
580 	struct lis3lv02d *lis3 = container_of(file->private_data,
581 					      struct lis3lv02d, miscdev);
582 
583 	clear_bit(0, &lis3->misc_opened); /* release the device */
584 	if (lis3->pm_dev)
585 		pm_runtime_put(lis3->pm_dev);
586 	return 0;
587 }
588 
589 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
590 				size_t count, loff_t *pos)
591 {
592 	struct lis3lv02d *lis3 = container_of(file->private_data,
593 					      struct lis3lv02d, miscdev);
594 
595 	DECLARE_WAITQUEUE(wait, current);
596 	u32 data;
597 	unsigned char byte_data;
598 	ssize_t retval = 1;
599 
600 	if (count < 1)
601 		return -EINVAL;
602 
603 	add_wait_queue(&lis3->misc_wait, &wait);
604 	while (true) {
605 		set_current_state(TASK_INTERRUPTIBLE);
606 		data = atomic_xchg(&lis3->count, 0);
607 		if (data)
608 			break;
609 
610 		if (file->f_flags & O_NONBLOCK) {
611 			retval = -EAGAIN;
612 			goto out;
613 		}
614 
615 		if (signal_pending(current)) {
616 			retval = -ERESTARTSYS;
617 			goto out;
618 		}
619 
620 		schedule();
621 	}
622 
623 	if (data < 255)
624 		byte_data = data;
625 	else
626 		byte_data = 255;
627 
628 	/* make sure we are not going into copy_to_user() with
629 	 * TASK_INTERRUPTIBLE state */
630 	set_current_state(TASK_RUNNING);
631 	if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
632 		retval = -EFAULT;
633 
634 out:
635 	__set_current_state(TASK_RUNNING);
636 	remove_wait_queue(&lis3->misc_wait, &wait);
637 
638 	return retval;
639 }
640 
641 static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
642 {
643 	struct lis3lv02d *lis3 = container_of(file->private_data,
644 					      struct lis3lv02d, miscdev);
645 
646 	poll_wait(file, &lis3->misc_wait, wait);
647 	if (atomic_read(&lis3->count))
648 		return EPOLLIN | EPOLLRDNORM;
649 	return 0;
650 }
651 
652 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
653 {
654 	struct lis3lv02d *lis3 = container_of(file->private_data,
655 					      struct lis3lv02d, miscdev);
656 
657 	return fasync_helper(fd, file, on, &lis3->async_queue);
658 }
659 
660 static const struct file_operations lis3lv02d_misc_fops = {
661 	.owner   = THIS_MODULE,
662 	.llseek  = no_llseek,
663 	.read    = lis3lv02d_misc_read,
664 	.open    = lis3lv02d_misc_open,
665 	.release = lis3lv02d_misc_release,
666 	.poll    = lis3lv02d_misc_poll,
667 	.fasync  = lis3lv02d_misc_fasync,
668 };
669 
670 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
671 {
672 	struct input_dev *input_dev;
673 	int err;
674 	int max_val, fuzz, flat;
675 	int btns[] = {BTN_X, BTN_Y, BTN_Z};
676 
677 	if (lis3->idev)
678 		return -EINVAL;
679 
680 	lis3->idev = input_allocate_polled_device();
681 	if (!lis3->idev)
682 		return -ENOMEM;
683 
684 	lis3->idev->poll = lis3lv02d_joystick_poll;
685 	lis3->idev->open = lis3lv02d_joystick_open;
686 	lis3->idev->close = lis3lv02d_joystick_close;
687 	lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
688 	lis3->idev->poll_interval_min = MDPS_POLL_MIN;
689 	lis3->idev->poll_interval_max = MDPS_POLL_MAX;
690 	lis3->idev->private = lis3;
691 	input_dev = lis3->idev->input;
692 
693 	input_dev->name       = "ST LIS3LV02DL Accelerometer";
694 	input_dev->phys       = DRIVER_NAME "/input0";
695 	input_dev->id.bustype = BUS_HOST;
696 	input_dev->id.vendor  = 0;
697 	input_dev->dev.parent = &lis3->pdev->dev;
698 
699 	set_bit(EV_ABS, input_dev->evbit);
700 	max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
701 	if (lis3->whoami == WAI_12B) {
702 		fuzz = LIS3_DEFAULT_FUZZ_12B;
703 		flat = LIS3_DEFAULT_FLAT_12B;
704 	} else {
705 		fuzz = LIS3_DEFAULT_FUZZ_8B;
706 		flat = LIS3_DEFAULT_FLAT_8B;
707 	}
708 	fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
709 	flat = (flat * lis3->scale) / LIS3_ACCURACY;
710 
711 	input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
712 	input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
713 	input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
714 
715 	lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
716 	lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
717 	lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
718 
719 	err = input_register_polled_device(lis3->idev);
720 	if (err) {
721 		input_free_polled_device(lis3->idev);
722 		lis3->idev = NULL;
723 	}
724 
725 	return err;
726 }
727 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
728 
729 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
730 {
731 	if (lis3->irq)
732 		free_irq(lis3->irq, lis3);
733 	if (lis3->pdata && lis3->pdata->irq2)
734 		free_irq(lis3->pdata->irq2, lis3);
735 
736 	if (!lis3->idev)
737 		return;
738 
739 	if (lis3->irq)
740 		misc_deregister(&lis3->miscdev);
741 	input_unregister_polled_device(lis3->idev);
742 	input_free_polled_device(lis3->idev);
743 	lis3->idev = NULL;
744 }
745 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
746 
747 /* Sysfs stuff */
748 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
749 {
750 	/*
751 	 * SYSFS functions are fast visitors so put-call
752 	 * immediately after the get-call. However, keep
753 	 * chip running for a while and schedule delayed
754 	 * suspend. This way periodic sysfs calls doesn't
755 	 * suffer from relatively long power up time.
756 	 */
757 
758 	if (lis3->pm_dev) {
759 		pm_runtime_get_sync(lis3->pm_dev);
760 		pm_runtime_put_noidle(lis3->pm_dev);
761 		pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
762 	}
763 }
764 
765 static ssize_t lis3lv02d_selftest_show(struct device *dev,
766 				struct device_attribute *attr, char *buf)
767 {
768 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
769 	s16 values[3];
770 
771 	static const char ok[] = "OK";
772 	static const char fail[] = "FAIL";
773 	static const char irq[] = "FAIL_IRQ";
774 	const char *res;
775 
776 	lis3lv02d_sysfs_poweron(lis3);
777 	switch (lis3lv02d_selftest(lis3, values)) {
778 	case SELFTEST_FAIL:
779 		res = fail;
780 		break;
781 	case SELFTEST_IRQ:
782 		res = irq;
783 		break;
784 	case SELFTEST_OK:
785 	default:
786 		res = ok;
787 		break;
788 	}
789 	return sprintf(buf, "%s %d %d %d\n", res,
790 		values[0], values[1], values[2]);
791 }
792 
793 static ssize_t lis3lv02d_position_show(struct device *dev,
794 				struct device_attribute *attr, char *buf)
795 {
796 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
797 	int x, y, z;
798 
799 	lis3lv02d_sysfs_poweron(lis3);
800 	mutex_lock(&lis3->mutex);
801 	lis3lv02d_get_xyz(lis3, &x, &y, &z);
802 	mutex_unlock(&lis3->mutex);
803 	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
804 }
805 
806 static ssize_t lis3lv02d_rate_show(struct device *dev,
807 			struct device_attribute *attr, char *buf)
808 {
809 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
810 
811 	lis3lv02d_sysfs_poweron(lis3);
812 	return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
813 }
814 
815 static ssize_t lis3lv02d_rate_set(struct device *dev,
816 				struct device_attribute *attr, const char *buf,
817 				size_t count)
818 {
819 	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
820 	unsigned long rate;
821 	int ret;
822 
823 	ret = kstrtoul(buf, 0, &rate);
824 	if (ret)
825 		return ret;
826 
827 	lis3lv02d_sysfs_poweron(lis3);
828 	if (lis3lv02d_set_odr(lis3, rate))
829 		return -EINVAL;
830 
831 	return count;
832 }
833 
834 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
835 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
836 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
837 					    lis3lv02d_rate_set);
838 
839 static struct attribute *lis3lv02d_attributes[] = {
840 	&dev_attr_selftest.attr,
841 	&dev_attr_position.attr,
842 	&dev_attr_rate.attr,
843 	NULL
844 };
845 
846 static const struct attribute_group lis3lv02d_attribute_group = {
847 	.attrs = lis3lv02d_attributes
848 };
849 
850 
851 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
852 {
853 	lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
854 	if (IS_ERR(lis3->pdev))
855 		return PTR_ERR(lis3->pdev);
856 
857 	platform_set_drvdata(lis3->pdev, lis3);
858 	return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
859 }
860 
861 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
862 {
863 	sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
864 	platform_device_unregister(lis3->pdev);
865 	if (lis3->pm_dev) {
866 		/* Barrier after the sysfs remove */
867 		pm_runtime_barrier(lis3->pm_dev);
868 
869 		/* SYSFS may have left chip running. Turn off if necessary */
870 		if (!pm_runtime_suspended(lis3->pm_dev))
871 			lis3lv02d_poweroff(lis3);
872 
873 		pm_runtime_disable(lis3->pm_dev);
874 		pm_runtime_set_suspended(lis3->pm_dev);
875 	}
876 	kfree(lis3->reg_cache);
877 	return 0;
878 }
879 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
880 
881 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
882 				struct lis3lv02d_platform_data *p)
883 {
884 	int err;
885 	int ctrl2 = p->hipass_ctrl;
886 
887 	if (p->click_flags) {
888 		lis3->write(lis3, CLICK_CFG, p->click_flags);
889 		lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
890 		lis3->write(lis3, CLICK_LATENCY, p->click_latency);
891 		lis3->write(lis3, CLICK_WINDOW, p->click_window);
892 		lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
893 		lis3->write(lis3, CLICK_THSY_X,
894 			(p->click_thresh_x & 0xf) |
895 			(p->click_thresh_y << 4));
896 
897 		if (lis3->idev) {
898 			struct input_dev *input_dev = lis3->idev->input;
899 			input_set_capability(input_dev, EV_KEY, BTN_X);
900 			input_set_capability(input_dev, EV_KEY, BTN_Y);
901 			input_set_capability(input_dev, EV_KEY, BTN_Z);
902 		}
903 	}
904 
905 	if (p->wakeup_flags) {
906 		lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
907 		lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
908 		/* pdata value + 1 to keep this backward compatible*/
909 		lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
910 		ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
911 	}
912 
913 	if (p->wakeup_flags2) {
914 		lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
915 		lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
916 		/* pdata value + 1 to keep this backward compatible*/
917 		lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
918 		ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
919 	}
920 	/* Configure hipass filters */
921 	lis3->write(lis3, CTRL_REG2, ctrl2);
922 
923 	if (p->irq2) {
924 		err = request_threaded_irq(p->irq2,
925 					NULL,
926 					lis302dl_interrupt_thread2_8b,
927 					IRQF_TRIGGER_RISING | IRQF_ONESHOT |
928 					(p->irq_flags2 & IRQF_TRIGGER_MASK),
929 					DRIVER_NAME, lis3);
930 		if (err < 0)
931 			pr_err("No second IRQ. Limited functionality\n");
932 	}
933 }
934 
935 #ifdef CONFIG_OF
936 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
937 {
938 	struct lis3lv02d_platform_data *pdata;
939 	struct device_node *np = lis3->of_node;
940 	u32 val;
941 	s32 sval;
942 
943 	if (!lis3->of_node)
944 		return 0;
945 
946 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
947 	if (!pdata)
948 		return -ENOMEM;
949 
950 	if (of_get_property(np, "st,click-single-x", NULL))
951 		pdata->click_flags |= LIS3_CLICK_SINGLE_X;
952 	if (of_get_property(np, "st,click-double-x", NULL))
953 		pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
954 
955 	if (of_get_property(np, "st,click-single-y", NULL))
956 		pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
957 	if (of_get_property(np, "st,click-double-y", NULL))
958 		pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
959 
960 	if (of_get_property(np, "st,click-single-z", NULL))
961 		pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
962 	if (of_get_property(np, "st,click-double-z", NULL))
963 		pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
964 
965 	if (!of_property_read_u32(np, "st,click-threshold-x", &val))
966 		pdata->click_thresh_x = val;
967 	if (!of_property_read_u32(np, "st,click-threshold-y", &val))
968 		pdata->click_thresh_y = val;
969 	if (!of_property_read_u32(np, "st,click-threshold-z", &val))
970 		pdata->click_thresh_z = val;
971 
972 	if (!of_property_read_u32(np, "st,click-time-limit", &val))
973 		pdata->click_time_limit = val;
974 	if (!of_property_read_u32(np, "st,click-latency", &val))
975 		pdata->click_latency = val;
976 	if (!of_property_read_u32(np, "st,click-window", &val))
977 		pdata->click_window = val;
978 
979 	if (of_get_property(np, "st,irq1-disable", NULL))
980 		pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
981 	if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
982 		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
983 	if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
984 		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
985 	if (of_get_property(np, "st,irq1-data-ready", NULL))
986 		pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
987 	if (of_get_property(np, "st,irq1-click", NULL))
988 		pdata->irq_cfg |= LIS3_IRQ1_CLICK;
989 
990 	if (of_get_property(np, "st,irq2-disable", NULL))
991 		pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
992 	if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
993 		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
994 	if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
995 		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
996 	if (of_get_property(np, "st,irq2-data-ready", NULL))
997 		pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
998 	if (of_get_property(np, "st,irq2-click", NULL))
999 		pdata->irq_cfg |= LIS3_IRQ2_CLICK;
1000 
1001 	if (of_get_property(np, "st,irq-open-drain", NULL))
1002 		pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
1003 	if (of_get_property(np, "st,irq-active-low", NULL))
1004 		pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
1005 
1006 	if (!of_property_read_u32(np, "st,wu-duration-1", &val))
1007 		pdata->duration1 = val;
1008 	if (!of_property_read_u32(np, "st,wu-duration-2", &val))
1009 		pdata->duration2 = val;
1010 
1011 	if (of_get_property(np, "st,wakeup-x-lo", NULL))
1012 		pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
1013 	if (of_get_property(np, "st,wakeup-x-hi", NULL))
1014 		pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
1015 	if (of_get_property(np, "st,wakeup-y-lo", NULL))
1016 		pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
1017 	if (of_get_property(np, "st,wakeup-y-hi", NULL))
1018 		pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
1019 	if (of_get_property(np, "st,wakeup-z-lo", NULL))
1020 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
1021 	if (of_get_property(np, "st,wakeup-z-hi", NULL))
1022 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
1023 	if (of_get_property(np, "st,wakeup-threshold", &val))
1024 		pdata->wakeup_thresh = val;
1025 
1026 	if (of_get_property(np, "st,wakeup2-x-lo", NULL))
1027 		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
1028 	if (of_get_property(np, "st,wakeup2-x-hi", NULL))
1029 		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
1030 	if (of_get_property(np, "st,wakeup2-y-lo", NULL))
1031 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
1032 	if (of_get_property(np, "st,wakeup2-y-hi", NULL))
1033 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
1034 	if (of_get_property(np, "st,wakeup2-z-lo", NULL))
1035 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
1036 	if (of_get_property(np, "st,wakeup2-z-hi", NULL))
1037 		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
1038 	if (of_get_property(np, "st,wakeup2-threshold", &val))
1039 		pdata->wakeup_thresh2 = val;
1040 
1041 	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
1042 		switch (val) {
1043 		case 1:
1044 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
1045 			break;
1046 		case 2:
1047 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
1048 			break;
1049 		case 4:
1050 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
1051 			break;
1052 		case 8:
1053 			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
1054 			break;
1055 		}
1056 	}
1057 
1058 	if (of_get_property(np, "st,hipass1-disable", NULL))
1059 		pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
1060 	if (of_get_property(np, "st,hipass2-disable", NULL))
1061 		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
1062 
1063 	if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
1064 		pdata->axis_x = sval;
1065 	if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
1066 		pdata->axis_y = sval;
1067 	if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
1068 		pdata->axis_z = sval;
1069 
1070 	if (of_get_property(np, "st,default-rate", NULL))
1071 		pdata->default_rate = val;
1072 
1073 	if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
1074 		pdata->st_min_limits[0] = sval;
1075 	if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
1076 		pdata->st_min_limits[1] = sval;
1077 	if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
1078 		pdata->st_min_limits[2] = sval;
1079 
1080 	if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
1081 		pdata->st_max_limits[0] = sval;
1082 	if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
1083 		pdata->st_max_limits[1] = sval;
1084 	if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
1085 		pdata->st_max_limits[2] = sval;
1086 
1087 
1088 	lis3->pdata = pdata;
1089 
1090 	return 0;
1091 }
1092 
1093 #else
1094 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
1095 {
1096 	return 0;
1097 }
1098 #endif
1099 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
1100 
1101 /*
1102  * Initialise the accelerometer and the various subsystems.
1103  * Should be rather independent of the bus system.
1104  */
1105 int lis3lv02d_init_device(struct lis3lv02d *lis3)
1106 {
1107 	int err;
1108 	irq_handler_t thread_fn;
1109 	int irq_flags = 0;
1110 
1111 	lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
1112 
1113 	switch (lis3->whoami) {
1114 	case WAI_12B:
1115 		pr_info("12 bits sensor found\n");
1116 		lis3->read_data = lis3lv02d_read_12;
1117 		lis3->mdps_max_val = 2048;
1118 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
1119 		lis3->odrs = lis3_12_rates;
1120 		lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
1121 		lis3->scale = LIS3_SENSITIVITY_12B;
1122 		lis3->regs = lis3_wai12_regs;
1123 		lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
1124 		break;
1125 	case WAI_8B:
1126 		pr_info("8 bits sensor found\n");
1127 		lis3->read_data = lis3lv02d_read_8;
1128 		lis3->mdps_max_val = 128;
1129 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1130 		lis3->odrs = lis3_8_rates;
1131 		lis3->odr_mask = CTRL1_DR;
1132 		lis3->scale = LIS3_SENSITIVITY_8B;
1133 		lis3->regs = lis3_wai8_regs;
1134 		lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
1135 		break;
1136 	case WAI_3DC:
1137 		pr_info("8 bits 3DC sensor found\n");
1138 		lis3->read_data = lis3lv02d_read_8;
1139 		lis3->mdps_max_val = 128;
1140 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1141 		lis3->odrs = lis3_3dc_rates;
1142 		lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
1143 		lis3->scale = LIS3_SENSITIVITY_8B;
1144 		break;
1145 	case WAI_3DLH:
1146 		pr_info("16 bits lis331dlh sensor found\n");
1147 		lis3->read_data = lis331dlh_read_data;
1148 		lis3->mdps_max_val = 2048; /* 12 bits for 2G */
1149 		lis3->shift_adj = SHIFT_ADJ_2G;
1150 		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1151 		lis3->odrs = lis3_3dlh_rates;
1152 		lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
1153 		lis3->scale = LIS3DLH_SENSITIVITY_2G;
1154 		break;
1155 	default:
1156 		pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1157 		return -EINVAL;
1158 	}
1159 
1160 	lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1161 				     sizeof(lis3_wai12_regs)), GFP_KERNEL);
1162 
1163 	if (lis3->reg_cache == NULL) {
1164 		printk(KERN_ERR DRIVER_NAME "out of memory\n");
1165 		return -ENOMEM;
1166 	}
1167 
1168 	mutex_init(&lis3->mutex);
1169 	atomic_set(&lis3->wake_thread, 0);
1170 
1171 	lis3lv02d_add_fs(lis3);
1172 	err = lis3lv02d_poweron(lis3);
1173 	if (err) {
1174 		lis3lv02d_remove_fs(lis3);
1175 		return err;
1176 	}
1177 
1178 	if (lis3->pm_dev) {
1179 		pm_runtime_set_active(lis3->pm_dev);
1180 		pm_runtime_enable(lis3->pm_dev);
1181 	}
1182 
1183 	if (lis3lv02d_joystick_enable(lis3))
1184 		pr_err("joystick initialization failed\n");
1185 
1186 	/* passing in platform specific data is purely optional and only
1187 	 * used by the SPI transport layer at the moment */
1188 	if (lis3->pdata) {
1189 		struct lis3lv02d_platform_data *p = lis3->pdata;
1190 
1191 		if (lis3->whoami == WAI_8B)
1192 			lis3lv02d_8b_configure(lis3, p);
1193 
1194 		irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1195 
1196 		lis3->irq_cfg = p->irq_cfg;
1197 		if (p->irq_cfg)
1198 			lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1199 
1200 		if (p->default_rate)
1201 			lis3lv02d_set_odr(lis3, p->default_rate);
1202 	}
1203 
1204 	/* bail if we did not get an IRQ from the bus layer */
1205 	if (!lis3->irq) {
1206 		pr_debug("No IRQ. Disabling /dev/freefall\n");
1207 		goto out;
1208 	}
1209 
1210 	/*
1211 	 * The sensor can generate interrupts for free-fall and direction
1212 	 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1213 	 * the things simple and _fast_ we activate it only for free-fall, so
1214 	 * no need to read register (very slow with ACPI). For the same reason,
1215 	 * we forbid shared interrupts.
1216 	 *
1217 	 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1218 	 * io-apic is not configurable (and generates a warning) but I keep it
1219 	 * in case of support for other hardware.
1220 	 */
1221 	if (lis3->pdata && lis3->whoami == WAI_8B)
1222 		thread_fn = lis302dl_interrupt_thread1_8b;
1223 	else
1224 		thread_fn = NULL;
1225 
1226 	err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1227 				thread_fn,
1228 				IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1229 				irq_flags,
1230 				DRIVER_NAME, lis3);
1231 
1232 	if (err < 0) {
1233 		pr_err("Cannot get IRQ\n");
1234 		goto out;
1235 	}
1236 
1237 	lis3->miscdev.minor	= MISC_DYNAMIC_MINOR;
1238 	lis3->miscdev.name	= "freefall";
1239 	lis3->miscdev.fops	= &lis3lv02d_misc_fops;
1240 
1241 	if (misc_register(&lis3->miscdev))
1242 		pr_err("misc_register failed\n");
1243 out:
1244 	return 0;
1245 }
1246 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1247 
1248 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1249 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1250 MODULE_LICENSE("GPL");
1251